Gossen Luna-Pro and batteries

Discussion in '35mm Cameras' started by R.Schenck, Dec 2, 2004.

  1. R.Schenck

    R.Schenck Guest

    I have a gossen luna pro light meter. Its pretty much like this
    http://www.butkus.org/chinon/lunasix3/lunasix3.htm

    The orignal design calls for "px13 or PX625" mercury batteries.
    Apparently one can purchase these, but is immeadiately shot by
    ecoterrorists for not caring about the environment.

    Anway, I have the replacement batteries for the 13 & 625, called the
    px625a. However, instead of 1.35 its 1.5v. So,i need to reduce the
    f-stops I am getting from it no? About two stops 'up'to adjust for
    'underexposure? I guess I must, beceause some of my photos are comming
    out over and underexposed when i use the meter. Does the camera's
    light meter have to allways be 'balanced' when I am using the lunapro?
    I mean, whats the sense of the meter right?

    I had initially started using it so I could get an idea of what other
    combinations of shutterspeed and apeture for a particular scence,
    rather than jump around with the camera itself, and it seems like, if
    i can get a consistent f-stop adjustment for the voltage difference
    it'd be interesting.


    And the 'computer' ring gives partial readings, like instead of 8 or
    11 its inbetween. This is something that the shutter speed adjuster
    can deal with, setting in between the marks?
     
    R.Schenck, Dec 2, 2004
    #1
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  2. R.Schenck

    me Guest

    You cannot compensate for the voltage difference between alkaline and
    mercury batteries by the method you suggest. You can buy an adapter made by
    Gossen that will allow you to use silver oxide batteries in your meter. B&H
    has it for $27.50:
    http://www.bhphotovideo.com/bnh/con...kw=GOAKBHLP&is=REG&Q=&O=productlist&sku=89868
    Or you could use # 675 1.4 volt hearing aid batteries which cost $5. for 6
    batteries from Walgreens. You'll need to go to a hardware store and find
    some o-rings to make up for the smaller diameter of the hearing aid
    batteries or you could do what I did and use a piece of plastic tubing as a
    sleeve for the batteries. Be sure to observe proper polarity when you put
    the batteries in. I've used hearing aid batteries successfully for about
    four months now but I know they won't last as long as silver oxide so I
    always carry spares.
    Good Luck!
    me
     
    me, Dec 2, 2004
    #2
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  3. You cannot compensate for the voltage difference between alkaline and
    http://www.bhphotovideo.com/bnh/con...kw=GOAKBHLP&is=REG&Q=&O=productlist&sku=89868


    I went the Gossen adapter route and am glad I did. Besides perfect readings,
    I get very long life from a pair of easily found silver batteries. And no
    worries about leakage if using an alkaline battery.
    Ken
     
    Ken Rosenbaum, Dec 2, 2004
    #3
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